The BGS Lexicon of Named Rock Units — Result Details

Clava Sand Member [Obsolete: use DROY]

Computer Code: CLSA Preferred Map Code: ClSa
Status Code: Index Level
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: [Obsolete: use DROY] Silty fine- to medium-grained, micaceous sand, containing graded beds and sparse drop-stones. Typically glacitectonised.
Definition of Lower Boundary: Gradational, at colour change, pale yellowish brown to olive grey. Boundary with (Clava) Shelly Clay Member.
Definition of Upper Boundary: Sharp, unconformable, glacitectonic boundary with Finglack Till Formation.
Thickness: 6.1m at type section, 4.2m at section NH74SE E9.
Geographical Limits: Sheet NH74SE
Parent Unit: none recorded or not applicable
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Lectostratotype (after Horne et al, 1894; combined 'Main Pit'section and boreholes 1 and 3). River cliff section of Cassie Burn. Section NH74SE E5 on 'standard' map. 
Reference Section  Hypostratotype (Section III of Peacock, 1975). River cliff section of Cassie Burn. Section NH74SE E9 on 'standard' map. 
Reference(s):
Horne, J and others, 1894. The character of the high-level shell-bearing deposits at Clava, Chapelhall and other localities. Report of the British Association for the Advancement of Science for 1883, p.483-514. 
Merritt, J W, 1990. The lithostratigraphy at Clava, Inverness-shire and a new model for the origin of its shell-bearing deposits as glacially-transported allochthons. "In" Auton, C A, Firth, C R and Merritt, J W. (Editors). Beauly to Nairn: Field Guide. Quaternary Research Association, Cambridge. 
Peacock, J D, 1975. Depositional environment of glacial deposits at Clava, north-east Scotland. Bulletin of the Geological Survey of Great Britain, No.49. 31-37. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S084